Chamfer strip



p 7, 1955 w. E. MITCHELL 2,718,685

CHAMF'ER STRIP Filed July 20, 1953 Will/Um E. Mfichel/ INVENTOR.

I BY MM 11% United States Patent This. invention relates to.v a chamferstrip. and? particu- "ice 2, copending application, Serial No...267,044, new Patent No. 2,650,410, filed; January 18,. 1952.

The chamfer strip itself comprises. a. plurality of elements, each,element beingconstructed as an angle: member 20..., and. a. filler, orcover strip 22. The. filler or cover.

- Str p 22 may be inthe, form of; a metallicpstrip. welded. or

otherwise secured across; the, open face of the. channel, or preferablyas shown in; Figure; 4,.the, filler may he atria angular wood strip 24.secured within the openface of. the channel by any suitable means.

plurality of chamfer elements. are. developed into i a frame includinga. pair of longitudinal frame, member larLy to. a chamfer. striparranged. as, a fr me to be mounted in. the mold form toprovide. achamfer atv the top of a casting made. therein.

In the construction; of. concrete structures, in mold forms, it isfrequently desirable to provide a chamfer adjacent the, edges; of thecasting; s that it. will not require further finishing and so that theedgeswill be quite rigid and strong in operation and not be crumbledaway by accidental impact therewith.

In order to prov-idesuchchamfer strips; the presentinvention provides aform. adapted tofit within. a mold form and to. provide a triangularform. adjacent the edge of the finished material. so. that a chamferwill bezfbrmed in the finished casting. This is. accomplished bymeanslofa triangular chamfer strip, with strips; arranged as elements of a frameadapted to slide within the mold form and havingl'oopsor-ears forsupporting the frame in position in the mold form and having reinforcingbars extending across the finished frame with the bottoms of thereinforcing bars being elevated out of the plane of the frame so thatfinishing tools or the like may be readily inserted thereunder.Preferably, the corners of the frame are also cut away or mitred so thatperpendicular chamfer strips in the mold may be accommodated therein.

The present application is in part a continuation of applicantscopending application, Serial No. 199,293, now Patent No. 2,650,411,filed December 5, 1950.

It is accordingly an object of the invention to provide an improvedchamfer strip.

It is a further object of the invention to provide a chamfer striparranged as a form or frame to be received in a mold form.

It is a further object of the invention to provide a chamfer strip soarranged that the top of a casting made therein may be readily finished.

Other objects and many of the attendant advantages of the presentinvention will be apparent from the following detailed description,taken in conjunction with the accompanying drawing in which:

Figure 1 is a sectional elevation of a chamfer strip in position in amold form;

Figure 2 is a perspective view of a chamfer strip according to theinvention;

Figure 3 is a similar view of a modified chamfer strip;

Figure 4 is a cross-section through an element of the chamfer striptaken substantially on the plane indicated by the line 44 of Figure 2;and,

Figure 5 is a fragmentary plan of a corner of the frame showing thecut-away or mitre to allow the frame to fit in a form having a cornerchamfer strip already therein.

In the exemplary embodiment according to the invention, a mold form sideconstructed of a plurality of channels 10 is spaced from another side ofthe mold form constructed of a channel 12 having a bulkhead 14 connectedacross the open side so that it forms a substantially closed device.Such mold forms being disclosed in my 28. and 30 joined together bymeans of cross, or end members 32 and 34 to provide asubstantiallyrectangular frame. to be inserted into the: mold. form asillustrated; in Eigure,,.l. Preferably the. corners of the. device are.rigidly connected. together by welding or the. like. so that. the.frameis. a rigid unitadapted to. be slidinto the top.- of the mold form.Obviously, the frame. instead of being rectangular may be of any desiredshape. to fit within a mold. form.

Also, as shown in Figure 3, the frame members. may be; constructed ofcurved; sidestrips36and. 3.8; having; bends 4.0. and, 42. therein sothat the. central portion of the chamfer strip. is elevated above. theend portions 32 and 34. Qbviously, the. chamfer strips maybe providedwith more than one; bend 40. and 42,, or the entirestrip maybe. curvedfrom, end to end. to form an arch or other curved surface; if desiredPreferably, the corners of the frames,-

are cut away or mitred, as, shown at 48, to-provido. a

cut-away or mit ed. corner to. accommodate avertically extending;chamfer strip. which will. beplaced the main form.

In order to properly locate the chamfer strip in a mold form, aplurality of cars or hanger members are preferably connected in pairs tothe frame device, and while any suitable ears may be used, I prefer touse a loop device constructed of a metallic rod bent into narrowU-shaped formation to provide a hanger having a longitudinally extendingslot 52 to receive the shank of suitable adjusting bolts. The lower endsof the legs 54 and 56 of the loop 50 are angulated outwardly to providefeet 58 which lie on the top of the element constituting the frame andare rigidly connected thereto by any suitable means, such as welding.Preferably the loop 50 extends upwardly substantially as a continuationof the outer face of the element 20, and is substantially flushtherewith. In securing the device in the mold form, the loop 50 willextend adjacent the surface of the mold form and be secured thereto bymeans of suitable fasten- Y ers such as the bolts 60 which extendthrough suitable apertures 62 in the mold form and are secured to theloops 50 by means of suitable fasteners such as the nut 64.

The loops 50 are preferably provided in pairs on opposite sides of theframework, and reinforcing bars extend between the legs 54 and 56 of theloops 50 and extend transversely across the framework with the ends ofthe bars being permanently and rigidly connected to the legs 54 and 56of the loop by any suitable means such as welding. The underside of thereinforcing bar 70 is cut away as at 74 to provide an arched upwardlybottom surface so that the bottom surface of the reinforcing bar 70 isin upwardly spaced relation to the top surface of the frame. Thisupwardly arched condition of the reinforcing bar permits a trowel orother working tool to be inserted under the bar to properly finish thetop of the casting within the form.

In the operation of the device according to the invention, suitablechamfer strips will be constructed for the standard mold sizes and forthe standard mold tops. Preferably the chamfer strip will be of theproper length to fit the shorter mold forms and to be utilized in alarger 3 mold form, the form will simply be cut across and separated toa mold form, and triangular wooden strips or filled metal angles will beinserted between the ends of the cut-apart frame to lengthen it to thedesired amount. The frame will be supported at any suitable point in themold form by means of the bolts 60 inserted in the aperture 62 in themold form, and tightened so as to be in little danger of displacementduring the pouring of the casting. Preferably the chamfer strip will becoated with a transparent plastic, usually in the form of a varnish orpaint to protect the outer surface of the material of which the strip isconstructed so that it will not rust and so that no undersirablecoloration will be transferred from thestrip to the cast material. Also,it is preferable to spray the mold form and the chamfer strip with alight oil immediately previous to constructing 'the casting therein sothatthere will be no danger of sticking or impacting the mold. a

For purposes of exemplification, a particular embodiment of theinvention has been shown and described according to the best presentunderstanding thereof. However, it will be apparent to those skilled inthe art that many changes and modifications in the arrangementand'construction of the parts thereof may be resorted to withoutdeparting from the true spirit and scope of the invention.

What is claimed as new is as follows:

1. A chamfer strip for use in a mold form comprising a frame adapted tobe positioned in a mold form, said frame being triangular incross-section, narrow U-shaped hangers, angulated ends on the legs ofsaid hangers, said angulated ends being rigidly secured on the top ofthe frame, said U-shaped hangers extending substantially flush with theouter edge of said frame.

. 2. A chamfer strip for use in a mold form comprising a frame adaptedto be positioned in a mold form, said frame being triangular incross-section, narrow U-shaped hangers, angulated ends on the legs ofsaid hangers, said angulated ends being rigidly secured on the top ofthe frame, said U-shaped hangers extending substantially flush with theouter edge of said frame, reinforcing members extending across saidframe, the ends of said members being received between the legs of saidU-shaped hangers and rigidly secured thereto, the bottom of saidreinforcing members being displaced upward out of the plane of saidframe.

3. A chamfer strip for use in a mold form comprising a frame adapted tobe positioned in a mold form, said frame being triangular incross-section, narrow U-shaped hangers, angulated ends .on the legs ofsaid hangers, said angulated ends being rigidly secured on the top ofthe frame, said Ushaped hangers extending substantially flush with theouter edge of said frame, reinforcing members extending across saidframe, the ends of said members being received between the legs of saidU-shaped hangers and rigidly secured thereto, the bottom of saidreinforcing members being displaced upward out of the plane of saidframe, the corners of said frame being cut away to receive a triangularchamfer member.

' References Cited in the file of this patent UNITED STATES PATENTSGreat Britain Mar. 13, 1930

